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Lithium ion battery double-sided continuous coating device and coating method thereof

A lithium-ion battery and coating equipment technology, which is applied to battery electrodes, electrode collector coatings, circuits, etc., can solve the problem of uneven thickness and surface density of pole pieces, poor consistency of lithium-ion batteries, and poor consistency of pole pieces, etc. problems, to achieve the effect of uniform thickness and surface density, easy operation, and improved coating efficiency

Active Publication Date: 2017-11-10
湖北猛狮新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current production of lithium-ion battery equipment has poor stability, especially the uneven thickness and surface density of the pole pieces coated by the horizontal single-sided coating machine, which will cause poor consistency of the pole pieces, resulting in poor consistency of lithium-ion batteries. The group rate is low, and it may even cause the battery to catch fire and explode
Moreover, the current horizontal single-sided coating machines can only coat on one side, that is, after the first side is coated and dried, the other side is coated and dried to obtain positive and negative pole pieces, which is low in efficiency and energy-efficient. high consumption

Method used

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  • Lithium ion battery double-sided continuous coating device and coating method thereof
  • Lithium ion battery double-sided continuous coating device and coating method thereof
  • Lithium ion battery double-sided continuous coating device and coating method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (a) Preparation of positive electrode sheet:

[0054] (a 1 ), lead copper foil or aluminum foil through automatic unwinding system A, traction mechanism B, coating machine head C, vertical vertical oven D, traction mechanism B, automatic winding system E;

[0055] (a 2 ), according to the mass percentage of positive electrode active material lithium iron phosphate 94%, SP conductive agent 1%, PVDF polyvinylidene fluoride 3%, then add the amount of methyl pyrrolidone according to the above solid content of 60%, mix and stir to obtain a uniform dispersion Positive electrode slurry;

[0056] (a 3 ), put the uniformly stirred positive electrode slurry in the feed tank C3 of the coating machine head C;

[0057] (a 4 ), set and adjust the relevant parameters of simultaneous double-sided continuous coating according to the process requirements: the simultaneous double-sided continuous coating speed is 10m / min, the temperature setting of vertical vertical oven D is control...

Embodiment 2

[0065] (a) Preparation of positive electrode sheet:

[0066] (a 1 ), lead copper foil or aluminum foil through automatic unwinding system A, traction mechanism B, coating machine head C, vertical vertical oven D, traction mechanism B, automatic winding system E;

[0067] (a 2 ), according to the mass percentage of positive electrode active material lithium manganese oxide 95%, SP conductive agent 1%, PVDF polyvinylidene fluoride 3%, then add methyl pyrrolidone according to the above solid content of 70%, mix and stir to obtain a uniformly dispersed positive electrode slurry;

[0068] (a 3 ), put the uniformly stirred positive electrode slurry in the feed tank C3 of the coating machine head C;

[0069] (a 4 ), set and adjust the relevant parameters of simultaneous double-sided continuous coating according to the process requirements: the simultaneous double-sided continuous coating speed is 20m / min, the temperature setting of vertical vertical oven D is controlled at 125°C...

Embodiment 3

[0077] (a) Preparation of positive electrode sheet:

[0078] (a 1 ), lead copper foil or aluminum foil through automatic unwinding system A, traction mechanism B, coating machine head C, vertical vertical oven D, traction mechanism B, automatic winding system E;

[0079] (a 2 ), according to the mass percentage of positive electrode active material ternary material 96%, SP conductive agent 1%, PVDF polyvinylidene fluoride 2%, then add NMP methyl pyrrolidone according to the above solid content of 75%, mix and stir to obtain a uniformly dispersed Positive electrode slurry;

[0080] (a 3 ), put the uniformly stirred positive electrode slurry in the feed tank C3 of the coating machine head C;

[0081] (a 4 ), set and adjust the relevant parameters of simultaneous double-sided continuous coating according to the process requirements: the simultaneous double-sided continuous coating speed is 50m / min, the vertical vertical oven D temperature setting is controlled at 150°C, and ...

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Abstract

A lithium ion battery double-sided continuous coating device and a coating method thereof are used for making a lithium ion battery. The device mainly includes an automatic unwinding system, a traction mechanism, a coating machine head, a vertical oven, an automatic winding system and a host control system. The method comprises the following steps: pulling a copper foil or an aluminum foil to go through the automatic unwinding system, the traction mechanism, the coating machine head, the vertical oven, the traction mechanism and the automatic winding system, placing a uniformly stirred positive electrode slurry or negative electrode slurry in a material tank, setting the coating speed, the surface density and the thickness of an electrode sheet, the temperature of the oven and other parameters according to process requirements, and making the electrode sheet in a double-sided continuous coating manner. The vertical oven and the coating head are adopted to carry out simultaneous double-sided coating of the electrode sheet, so the production process is simplified, the coating efficiency is high, the energy consumption and the cost are reduced, the electrode sheet has a uniform thickness and a uniform surface density, and the consistency and the safety of the lithium ion battery are guaranteed. The device and the method have the advantages of simple technical solution, easiness in operation, guaranteeing of stable, highly-efficient and continuous coating production, and high coating precision.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a double-sided continuous coating equipment for lithium ion batteries and a preparation method thereof. Background technique [0002] Due to the advantages of high specific energy, long cycle life, good safety performance, environmental friendliness and no memory effect, lithium-ion batteries have been widely and rapidly used in mobile phones, notebook computers, digital cameras and other fields. A lithium-ion battery with light weight, small size, wide operating temperature, good safety performance, high energy and long life is more and more highly favored by people. However, the current production of lithium-ion battery equipment has poor stability, especially the uneven thickness and surface density of the pole pieces coated by the horizontal single-sided coating machine, which will cause poor consistency of the pole pieces, resulting in poor consistency of lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/1391H01M4/1393H01M4/1397
CPCH01M4/0404H01M4/0409H01M4/1391H01M4/1393H01M4/1397Y02E60/10
Inventor 赖见李青海刘进康书文秦聚鑫胡云涛
Owner 湖北猛狮新能源科技有限公司